[Bug 1759920] Re: intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-image-4.13.0-37-generic)

[Gordon Lack]

These are the packages I have installed:

root at gmllaptop:/local/configs/packages# dpkg-query -l '*4.13.0-38*'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                      Version                   Architecture              Description
+++-=========================================-=========================-=========================-=======================================================================================
ii  linux-headers-4.13.0-38                   4.13.0-38.43              all                       Header files related to Linux kernel version 4.13.0
ii  linux-headers-4.13.0-38-generic           4.13.0-38.43              amd64                     Linux kernel headers for version 4.13.0 on 64 bit x86 SMP
ii  linux-image-4.13.0-38-generic             4.13.0-38.43+lp1759920.1  amd64                     Linux kernel image for version 4.13.0 on 64 bit x86 SMP
ii  linux-image-extra-4.13.0-38-generic       4.13.0-38.43+lp1759920.1  amd64                     Linux kernel extra modules for version 4.13.0 on 64 bit x86 SMP
ii  linux-signed-image-4.13.0-38-generic      4.13.0-38.43              amd64                     Signed kernel image generic


The signed one doesn't contain any binaries, just a signing file (this is a UEFI system).

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https://bugs.launchpad.net/bugs/1759920

Title:
  intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
  image-4.13.0-37-generic)

Status in intel-microcode package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in intel-microcode source package in Xenial:
  Confirmed
Status in linux source package in Xenial:
  Confirmed
Status in intel-microcode source package in Artful:
  Confirmed
Status in linux source package in Artful:
  Confirmed

Bug description:
  I don't know if this is a problem with the kernel or the microcode,
  but we have a significant number of computers in our organization (on
  both 16.04 and 17.10) that fail if they have both updated.  Booting
  with either linux-image-4.13.0-36-generic or intel-microcode
  3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to
  boot.

  ## Workaround ##
  1. Boot the system with the dis_ucode_ldr kernel boot parameter to temporary avoid the problem:
     https://wiki.ubuntu.com/Kernel/KernelBootParameters
  2. Install the previous version of package from
     https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/14261530/+files/intel-microcode_3.20180108.0+really20170707ubuntu16.04.1_amd64.deb
  3. (Optional) Hold the package so that it won't be upgraded accidentally
     sudo apt-mark hold intel-microcode

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